/Engine/Source/Runtime/MediaAssets/Public/MediaPlayer.h
Listen to EMediaEvent::MetadataChanged to catch updates to this data
Map with arrays of IMediaMetaDataItem entries describing any metadata found in the current stream
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [TMap](API\Runtime\Core\Containers\TMap)< [FString](API\Runtime\Core\Containers\FString), [TArray](API\Runtime\Core\Containers\TArray)< [TUniquePtr](API\Runtime\Core\Templates\TUniquePtr)< [IMediaMetadataItem](API\Runtime\Media\IMediaMetadataItem) > > >, ESPMode::ThreadSafe > GetMediaMetadata() const